① Triage
① Click on a location of interest
Ranked by true societal cost, not crash count. Pick a location on the map or in the list to diagnose why crashes happen there and which countermeasures pay off. Real VDOT data × FHWA costs
Rank by
Year
Find
Or pick
All 161 jurisdictions · top 40 color-coded by selected metric · click any
Top-40 circle color
lowertotal costhigher
● small grey = other jurisdictions
② Diagnose
Why crashes happen — and the countermeasures that pay off
Real crashes for the selected location, colored by collision type. The diagnosis below reads the actual crash-type mix; the recommendations are federal countermeasures matched to that pattern, ranked by benefit-cost. Real collision types [L]
Real injury crashes · colored by type · hover for detail
③ Decide
Model the investment & build the brief
Adjust the assumptions and watch the benefit-cost case update live. Everything starts from the countermeasure you picked, using this location's real crash counts. Real crash counts [L] · federal cost figures [V]
Pick a countermeasure first
Go to Causes & Mitigations, choose a countermeasure, and click Model → to bring it here pre-loaded.
Zoneium · ZILM Crash Safety Intelligence
Sources & methodology
Every figure in this tool traces to one of the sources below. Confidence is marked: [V] verified official source · [L] live from real data · [D] directional / planning assumption.
Crash data (the foundation)
Virginia crash records, 2022–2026
VDOT / Virginia TREDS crash database — 510,484 crash-level records with location, severity (KABCO), and collision type. [L] Real data
Crash costs
FHWA Crash Cost Spreadsheet (Oct 2025)
Official FHWA tool; national KABCO comprehensive costs in 2023 dollars. [V] Verified
Virginia cost adjustment
National figures scaled by Virginia’s Per Capita Income factor (×1.06). [D] Stated methodology
Collision types
Virginia FR300 Crash Report Manual
Official field definitions; ‘Type of Collision’ (field C18) code list. [V] Verified
Countermeasures & effectiveness
FHWA Proven Safety Countermeasures
Countermeasure library and target crash types. [V] Federal
FHWA CMF Clearinghouse
Crash Modification Factors (effectiveness). [V] factors; [D] where representative midpoints used
Representative unit-cost ranges
Planning-level cost-per-site ranges. [D] Directional — confirm locally
Geography
Virginia Jurisdictions boundary file
VDOT/Census jurisdiction polygons (county & city boundaries). [V] Official
Benefit-cost assumptions (planning-level)
Analysis horizon (default 10 yr)
Common period for infrastructure safety BCA. [D] Convention
Addressable share (default 40%)
Share of matched crashes a countermeasure can plausibly affect. [D] Adjustable
Sites estimate
Derived from county fatal+serious crash volume as a planning proxy. [D] Adjustable
This list documents the inputs behind a planning-level screening tool. It is not a substitute for site-specific engineering, a road-safety audit, or a formal benefit-cost analysis. Costs and effectiveness ranges should be confirmed against local conditions before programming funds.